Stay focused on your goals and get motivated to be more active with Flex—a slim, stylish device that tracks all-day activity like steps taken, distance traveled, calories burned and active minutes.Style your Flex tracker with bright accessory bands, or turn it into a fashion piece with our exclusive Flex collection from Tory Burch. To change bands, simply pop the slim Flex tracker out of your wristband and slip it into the accessory that fits your personality.